Fixes #772 (#779)

doc/preview_instructions.md

@@ -6,7 +6,7 @@ The Project AZ team is excited to offer a preview build for members of the GitHu
 Installation via CURL
 -----------------
 
-To install via cURL on Linux, Unix and OS X, type:
+To install via cURL on Linux and OS X, type:
 
     curl -L https://aka.ms/ProjectAzInstall | bash
 
@@ -14,6 +14,8 @@ If you chose to enable tab completion, type `exec -l $SHELL` to restart your she
 
 Note: This will install the latest verified nightly builds.  You may re-run this script later to safely update to the latest version.
 
+For more detailed information on installing the preview, please visit the [Preview Install Guide](https://github.com/Azure/azure-cli/blob/master/doc/preview_install_guide.md) page.
+
 Example Demo Script
 -------------------